sound/soc/atmel/sam9g20_wm8731.c

   1 /*
   2  * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
   3  *                      ATMEL AT91SAM9G20ek board.
   4  *
   5  *  Copyright (C) 2005 SAN People
   6  *  Copyright (C) 2008 Atmel
   7  *
   8  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
   9  *
  10  * Based on ati_b1_wm8731.c by:
  11  * Frank Mandarino <fmandarino@endrelia.com>
  12  * Copyright 2006 Endrelia Technologies Inc.
  13  * Based on corgi.c by:
  14  * Copyright 2005 Wolfson Microelectronics PLC.
  15  * Copyright 2005 Openedhand Ltd.
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/kernel.h>
  35 #include <linux/clk.h>
  36 #include <linux/timer.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/i2c.h>
  40
  41 #include <linux/atmel-ssc.h>
  42
  43 #include <sound/core.h>
  44 #include <sound/pcm.h>
  45 #include <sound/pcm_params.h>
  46 #include <sound/soc.h>
  47
  48 #include <asm/mach-types.h>
  49 #include <mach/hardware.h>
  50 #include <mach/gpio.h>
  51
  52 #include "../codecs/wm8731.h"
  53 #include "atmel-pcm.h"
  54 #include "atmel_ssc_dai.h"
  55
  56 #define MCLK_RATE 12000000
  57
  58 /*
  59  * As shipped the board does not have inputs.  However, it is relatively
  60  * straightforward to modify the board to hook them up so support is left
  61  * in the driver.
  62  */
  63 #undef ENABLE_MIC_INPUT
  64
  65 static struct clk *mclk;
  66
  67 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
  68         struct snd_pcm_hw_params *params)
  69 {
  70         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  71         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  72         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  73         int ret;
  74
  75         /* set codec DAI configuration */
  76         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
  77                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  78         if (ret < 0)
  79                 return ret;
  80
  81         /* set cpu DAI configuration */
  82         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
  83                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  84         if (ret < 0)
  85                 return ret;
  86
  87         return 0;
  88 }
  89
  90 static struct snd_soc_ops at91sam9g20ek_ops = {
  91         .hw_params = at91sam9g20ek_hw_params,
  92 };
  93
  94 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
  95                                         enum snd_soc_bias_level level)
  96 {
  97         static int mclk_on;
  98         int ret = 0;
  99
 100         switch (level) {
 101         case SND_SOC_BIAS_ON:
 102         case SND_SOC_BIAS_PREPARE:
 103                 if (!mclk_on)
 104                         ret = clk_enable(mclk);
 105                 if (ret == 0)
 106                         mclk_on = 1;
 107                 break;
 108
 109         case SND_SOC_BIAS_OFF:
 110         case SND_SOC_BIAS_STANDBY:
 111                 if (mclk_on)
 112                         clk_disable(mclk);
 113                 mclk_on = 0;
 114                 break;
 115         }
 116
 117         return ret;
 118 }
 119
 120 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
 121         SND_SOC_DAPM_MIC("Int Mic", NULL),
 122         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 123 };
 124
 125 static const struct snd_soc_dapm_route intercon[] = {
 126
 127         /* speaker connected to LHPOUT */
 128         {"Ext Spk", NULL, "LHPOUT"},
 129
 130         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
 131         {"MICIN", NULL, "Mic Bias"},
 132         {"Mic Bias", NULL, "Int Mic"},
 133 };
 134
 135 /*
 136  * Logic for a wm8731 as connected on a at91sam9g20ek board.
 137  */
 138 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
 139 {
 140         struct snd_soc_codec *codec = rtd->codec;
 141         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 142         struct snd_soc_dapm_context *dapm = &codec->dapm;
 143         int ret;
 144
 145         printk(KERN_DEBUG
 146                         "at91sam9g20ek_wm8731 "
 147                         ": at91sam9g20ek_wm8731_init() called\n");
 148
 149         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
 150                 MCLK_RATE, SND_SOC_CLOCK_IN);
 151         if (ret < 0) {
 152                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
 153                 return ret;
 154         }
 155
 156         /* Add specific widgets */
 157         snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets,
 158                                   ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
 159         /* Set up specific audio path interconnects */
 160         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 161
 162         /* not connected */
 163         snd_soc_dapm_nc_pin(dapm, "RLINEIN");
 164         snd_soc_dapm_nc_pin(dapm, "LLINEIN");
 165
 166 #ifdef ENABLE_MIC_INPUT
 167         snd_soc_dapm_enable_pin(dapm, "Int Mic");
 168 #else
 169         snd_soc_dapm_nc_pin(dapm, "Int Mic");
 170 #endif
 171
 172         /* always connected */
 173         snd_soc_dapm_enable_pin(dapm, "Ext Spk");
 174
 175         snd_soc_dapm_sync(dapm);
 176
 177         return 0;
 178 }
 179
 180 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 181         .name = "WM8731",
 182         .stream_name = "WM8731 PCM",
 183         .cpu_dai_name = "atmel-ssc-dai.0",
 184         .codec_dai_name = "wm8731-hifi",
 185         .init = at91sam9g20ek_wm8731_init,
 186         .platform_name = "atmel-pcm-audio",
 187         .codec_name = "wm8731.0-001b",
 188         .ops = &at91sam9g20ek_ops,
 189 };
 190
 191 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 192         .name = "AT91SAMG20-EK",
 193         .dai_link = &at91sam9g20ek_dai,
 194         .num_links = 1,
 195         .set_bias_level = at91sam9g20ek_set_bias_level,
 196 };
 197
 198 static struct platform_device *at91sam9g20ek_snd_device;
 199
 200 static int __init at91sam9g20ek_init(void)
 201 {
 202         struct clk *pllb;
 203         int ret;
 204
 205         if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc()))
 206                 return -ENODEV;
 207
 208         ret = atmel_ssc_set_audio(0);
 209         if (ret != 0) {
 210                 pr_err("Failed to set SSC 0 for audio: %d\n", ret);
 211                 return ret;
 212         }
 213
 214         /*
 215          * Codec MCLK is supplied by PCK0 - set it up.
 216          */
 217         mclk = clk_get(NULL, "pck0");
 218         if (IS_ERR(mclk)) {
 219                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 220                 ret = PTR_ERR(mclk);
 221                 goto err;
 222         }
 223
 224         pllb = clk_get(NULL, "pllb");
 225         if (IS_ERR(pllb)) {
 226                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 227                 ret = PTR_ERR(pllb);
 228                 goto err_mclk;
 229         }
 230         ret = clk_set_parent(mclk, pllb);
 231         clk_put(pllb);
 232         if (ret != 0) {
 233                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 234                 goto err_mclk;
 235         }
 236
 237         clk_set_rate(mclk, MCLK_RATE);
 238
 239         at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
 240         if (!at91sam9g20ek_snd_device) {
 241                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
 242                 ret = -ENOMEM;
 243                 goto err_mclk;
 244         }
 245
 246         platform_set_drvdata(at91sam9g20ek_snd_device,
 247                         &snd_soc_at91sam9g20ek);
 248
 249         ret = platform_device_add(at91sam9g20ek_snd_device);
 250         if (ret) {
 251                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
 252                 goto err_device_add;
 253         }
 254
 255         return ret;
 256
 257 err_device_add:
 258         platform_device_put(at91sam9g20ek_snd_device);
 259 err_mclk:
 260         clk_put(mclk);
 261         mclk = NULL;
 262 err:
 263         return ret;
 264 }
 265
 266 static void __exit at91sam9g20ek_exit(void)
 267 {
 268         platform_device_unregister(at91sam9g20ek_snd_device);
 269         at91sam9g20ek_snd_device = NULL;
 270         clk_put(mclk);
 271         mclk = NULL;
 272 }
 273
 274 module_init(at91sam9g20ek_init);
 275 module_exit(at91sam9g20ek_exit);
 276
 277 /* Module information */
 278 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 279 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 280 MODULE_LICENSE("GPL");